I don't think there is a way to answer this, especially this season- if one compares race fastest laps against pole position times there is a gap of several seconds (usu. between 2 and 5 seconds, the only exception being Silverstone with wet qualifying and dry race). It has been a bit off-putting for me, but that is besides the point... Will it help the question if I mention that Vettel's race FL was almost three seconds slower than his qualifying time, but Alonso's only 2.5?

Id be interested to know what Vettel's Q laptime would have been with the race setup he ended up using. In theory he would have been lower than the 3rd place but considering he started from the pitlane then dropped to the back again later on and still finished third anyway surely it would have been worth his while starting 6th or so with this more optimised race setup? Not unfeasible to think he could have won from there. I know The SC and other events worked out well for him but his race pace was excellent until the last stint which was strange. I've often thought RB are too qual focused, this proves it somewhat for me.

I can't tellyou in lap time but in straight line speed through the trap. Before the setup change the the Red Bulls were dead slowest through the trap. After the setup Vettel was fourth fastest. So it was a massive downforce shed they did. Basically they must have shifted their performance from the fast cornering to the straits in a big way. It is impressive that they did it without being able to test the setup. It was all derived from simulations.

I can't tellyou in lap time but in straight line speed through the trap. Before the setup change the the Red Bulls were dead slowest through the trap. After the setup Vettel was fourth fastest. So it was a massive downforce shed they did. Basically they must have shifted their performance from the fast cornering to the straits in a big way. It is impressive that they did it without being able to test the setup. It was all derived from simulations.

They did change gearing to avoid hitting the rev limiter when overtaking as RBR infamously tends to do. I wouldn't draw too many conclusions from best trap speeds when they are done with drafting and DRS open.